Application of ultra-high speed photography in identification of the dynamic tensile response of quasi-brittle materials

This paper investigates the application of CMOS-based ultra-high speed camera in characterising materials under dynamic tensile loading. A single Hopkinson bar test is used to induce an axial stress wave in the sample and a grid pattern is filmed during the test to obtain time-resolved full-field kinematic measurements. Then the acceleration fields are used to reconstruct the stress information and identify material response. Quasi-brittle materials (e.g. rocks and concrete) present a particular experimental challenge due to small deformation and low stress level at failure. The Shimadzu HPV-X2 acquisition system has been applied for such purpose and its performance was investigated by first performing a spalling test on an aluminium benchmark sample and then applied to testing ordinary concrete.

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